A chuck

Abstract

The utility model provides a chuck belongs to mechanical technical field. It has solved the problem that the existing chuck cannot adapt to the workpiece of different size specifications. The present utility model discloses a chuck, including the disc -shaped chuck body, three can slide along the chuck body radial ground connection in the front part of chuck body's sliding block and three chuck claws, and the chuck still includes three long board -shaped extension piece, three extension piece all set up in the front side of chuck body and the length direction of three extension pieces all along the radial setting of chuck body, three extension piece respectively through fastener detachably corresponding connection in the front side of three sliding blocks, and three extension piece far from chuck body axis one end all stretch out the outside surface of chuck body, three chuck claws detachably connect in the front side of three extension piece stretches out the chuck body place.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology and relates to a chuck. Background Technology

[0002] In the field of machining, workpieces need to be positioned using a fixing device before being processed with appropriate cutting tools. A three-jaw chuck is a commonly used fixing device.

[0003] Existing three-jaw chucks generally include a disc-shaped chuck body, three slides, three jaws, and a rod-shaped tie rod. The three slides are evenly distributed around the axis of the chuck body at the front. The tie rod is located inside the chuck body and is coaxial with the chuck body. The rear end of the tie rod is used to connect to a driving component such as a hydraulic cylinder or pneumatic cylinder, and the front end of the tie rod cooperates with the three slides, so that when the tie rod is driven axially by the driving component, it can drive the three slides to move synchronously radially along the chuck body. The three jaws are respectively fixed to the front side of the three slides by screws and extend out of the chuck body. The three jaws can move radially synchronously with the three slides, moving closer or further apart to clamp or release the workpiece.

[0004] However, the slide travel of existing three-jaw chucks on the market is generally small. When different diameter workpieces need to be clamped at the same station, and the diameter of the workpiece exceeds the travel range of the jaws, a larger chuck must be used to clamp different workpieces. This is not only time-consuming and labor-intensive, but also requires users to store different chucks at the work site, resulting in higher production costs. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a chuck that solves the problem that existing chucks cannot adapt to clamping workpieces of different sizes and specifications.

[0006] The objective of this utility model can be achieved through the following technical solutions: A chuck includes a disc-shaped chuck body, three sliders slidably connected to the front of the chuck body along the radial direction of the chuck body, and three jaws. The chuck further includes three elongated plate-shaped extensions, each disposed on the front side of the chuck body with its length direction along the radial direction of the chuck body. Each extension is detachably connected to the front side of the three sliders via fasteners, and one end of each extension away from the axis of the chuck body extends beyond the outer surface of the chuck body. The three jaws are detachably connected to the front sides of the three extensions where they extend out of the chuck body.

[0007] The side of the chuck used to clamp the workpiece is designated as the front side. In this chuck, three extensions are fixed to the front side of the slider on the chuck body, with one end of each extension extending beyond the outer surface of the chuck body. When the jaws are connected to the front side where the extensions extend from the chuck body, because the jaws are further away from the axis of the chuck body, the same slider stroke can achieve clamping of workpieces with a wider range of sizes. Thus, in practical use, when using the same chuck for smaller workpieces, the extensions can be removed, and the jaws can be directly connected to the slider to clamp the small workpieces. When using larger workpieces, extensions can be installed on the slider, and the jaws can be moved along the length of the extensions away from the axis of the chuck body, increasing the distance between the three jaws. This allows for clamping of larger workpieces with the same slider stroke, improving the applicability of this chuck. Furthermore, when changing different workpieces to be clamped, the entire chuck does not need to be removed, making operation more convenient.

[0008] In the aforementioned chuck, each of the three extension members has a straight, T-shaped mounting groove on its front side. Each of the three extension members has several mounting holes spaced apart along its length. The three jaws can be connected to these mounting holes via fasteners. Existing jaws often have a protruding T-shaped locking block on their rear side for engaging with a slider. The T-shaped grooves on the extension members allow for direct engagement with existing locking blocks, making connection more convenient. The spaced mounting holes along the length of the extension members allow for the selection of one or two to fix the jaws at different positions on the extension members, accommodating workpieces of different sizes.

[0009] In the aforementioned chuck, the rear sides of all three extension members have protruding sliding portions with a T-shaped cross-section, and the front sides of all three sliders have T-shaped straight grooves. The three sliding portions are slidably connected to the three grooves. Each slider has several connecting holes for fastener connection, with the connecting holes on each slider spaced apart along the length of the groove. Existing sliders have T-shaped grooves for engaging with jaws; the T-shaped sliding portions on the extension members facilitate engagement with the sliders, and the multiple connecting holes allow the extension members to be easily fixed at different positions using fasteners according to the clamping requirements of workpieces of different sizes.

[0010] In the aforementioned chuck, each of the three extension members has a clearance surface on both sides of its end facing the chuck body axis, which is inclined relative to the length direction of the extension member. The distance between the two clearance surfaces on each extension member gradually decreases from the end of the extension member away from the chuck body axis toward the chuck body axis. The inclined clearance surface reduces interference when the three extension members approach each other.

[0011] Compared with existing technologies, this chuck has the following advantages: 1. By utilizing the detachable extension, the distance between the three jaws can be increased, allowing existing chucks to meet clamping requirements simply by assembling and disassembling the extension, depending on the size of the workpiece. This makes it widely applicable, easy to operate, and eliminates the need to stock a large number of chucks of different sizes, thus reducing costs.

[0012] 2. The mounting slots and sliding parts on the extension can be directly matched with the universal sliders and jaws on existing chucks without the need to modify the sliders and jaws, making it highly versatile. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the chuck without the jaws installed.

[0014] Figure 2 This is a cross-sectional structural diagram showing the connection between the slider, extension, and jaws in this chuck.

[0015] In the diagram, 1 is the chuck body; 2 is the slider; 3 is the jaw; 4 is the extension; 41 is the mounting slot; 42 is the clearance surface; and 5 is the fastener. Detailed Implementation

[0016] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0017] like Figure 1 and Figure 2 As shown, this chuck includes a disc-shaped chuck body 1, three block-shaped sliders 2, and three jaws 3. The three sliders 2 are evenly distributed around the axis of the chuck body 1, and the three sliders 2 can slide back and forth along the radial direction of the chuck body 1. Here, the chuck body 1, sliders 2, jaws 3, and the pull rod used to move the three sliders 2 are all existing technologies of existing chucks, and this invention does not make any improvements to their specific structures. For example, the front side of each slider 2 has a T-shaped straight groove, and the rear side of each jaw 3 has a protruding T-shaped block that can slide with the groove.

[0018] The chuck also includes three extension members 4, each of which is long and plate-shaped. The three extension members 4 are all located on the front side of the chuck body 1 and their length direction is radially arranged along the chuck body 1. The three extension members 4 are detachably connected to the front side of the three sliders 2 by fasteners 5, and the ends of the three extension members 4 away from the axis of the chuck body 1 extend out of the outer side of the chuck body 1. The three jaws 3 are detachably connected to the front side of the three extension members 4 where they extend out of the chuck body 1.

[0019] In this embodiment, the structures at points 4 of the three extension members are completely identical. The following description will take the structure of one of the extension plates as an example.

[0020] A straight mounting groove 41 is provided at the center of the front side of the extension member 4, and the length direction of the mounting groove 41 is consistent with the length direction of the extension member 4. The mounting groove 41 is a T-shaped groove, which can slide and engage with the locking block on the claw 3. Several threaded mounting holes are provided at the bottom of the mounting groove 41, and the mounting holes are spaced apart along the length direction of the extension member 4. The claw 3 can be connected to the mounting holes by screws, which are fasteners 5, passing through the claw 3 in the front-back direction. Specifically, the screw shank is threaded into the mounting hole, and the screw head is pressed tightly against the claw 3.

[0021] The rear side of the extension member 4 has a protruding T-shaped sliding part, which is slidably connected to the groove. Several threaded holes are provided at the bottom of the groove of the slider 2, and these holes are spaced apart along the moving direction of the slider 2. Two clearance holes are provided through the bottom of the mounting groove 41 of the extension member 4. These clearance holes are offset from the mounting holes and are stepped holes, with the diameter at the front end of the stepped hole being larger than the diameter at the rear end. A screw serving as a fastener 5 passes through the clearance hole of the extension member 4. The shank of the screw passes through the clearance hole and is threadedly connected to the connecting hole. The head of the screw is located inside the front end of the clearance hole and does not protrude from the bottom surface of the mounting groove 41, ensuring that the pawl 3 can slide smoothly within the mounting groove 41.

[0022] The extension member 4 has two relief surfaces 42 on both sides of the end facing the axis of the chuck body 1, which are inclined relative to the length direction of the extension member 4. The distance between the two relief surfaces 42 gradually decreases from the end of the extension member 4 away from the axis of the chuck body 1 toward the axis of the chuck body 1.

[0023] When this chuck is clamping small workpieces, that is, when the size of the workpiece is within the clamping range, the jaws 3 are directly fixed on the slider 2, which is the existing chuck. The movement of the slider 2 directly drives the jaws 3 to move radially to clamp the workpiece.

[0024] When it is necessary to clamp large workpieces, i.e., when the workpiece size exceeds the clamping range of the existing chuck, remove the jaws 3, install the extension piece 4 at a suitable position on the slider 2, and then move the jaws 3 along the length of the extension piece 4 away from the axis of the chuck body 1 to increase the distance between the three jaws 3, so as to achieve clamping of large workpieces with the same slider 2 stroke.

[0025] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A chuck, comprising a disc-shaped chuck body (1), three sliders (2) slidably connected to the front of the chuck body (1) radially along the chuck body (1), and three jaws (3), characterized in that, The chuck also includes three long plate-shaped extensions (4). The three extensions (4) are all located on the front side of the chuck body (1) and the length direction of the three extensions (4) is radially arranged along the chuck body (1). The three extensions (4) are detachably connected to the front side of the three sliders (2) by fasteners (5). The end of the three extensions (4) away from the axis of the chuck body (1) extends out of the outer side of the chuck body (1). The three jaws (3) are detachably connected to the front side of the three extensions (4) where they extend out of the chuck body (1).

2. A chuck according to claim 1, characterized in that, The front side of each of the three extension members (4) is provided with a straight mounting groove (41), which is a T-shaped groove. Each of the three extension members (4) is provided with several mounting holes, which are distributed at intervals along the length of the extension member (4). The three claws (3) can be connected to the mounting holes respectively by fasteners (5).

3. A chuck according to claim 2, characterized in that, The rear side of each of the three extension members (4) has a protruding sliding part with a T-shaped cross section. The front side of each of the three sliders (2) has a sliding groove with a T-shaped straight groove. The three sliding parts are slidably connected to the three sliding grooves. Each of the three sliders (2) has several connecting holes for fasteners (5) to connect. The connecting holes on each slider (2) are spaced apart along the length of the sliding groove.

4. A chuck according to claim 1, 2, or 3, characterized in that, Each of the three extension members (4) has a relief surface (42) on both sides of one end facing the axis of the chuck body (1) that is inclined relative to the length direction of the extension member (4). The distance between the two relief surfaces (42) on each extension member (4) gradually decreases from the end of the extension member (4) away from the axis of the chuck body (1) toward the axis of the chuck body (1).

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